Initial study of the optical spectrum of the ISIS H− ion source plasma

Lawrie, Scott; Faircloth, D. C.; Philippe, Keckhut

doi:10.1063/1.3662959

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…It is possible to work out the electron temperature k B T e from the ratios of the peaks. 3 The electron temperature does not increase for discharge currents greater than 80 A as shown in Fig. 6.…”

Section: B Vary Pulsed Discharge Currentmentioning

confidence: 83%

Optimizing the front end test stand high performance H− ion source at RAL

Faircloth

Lawrie

Gabor

et al. 2012

Review of Scientific Instruments

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The aim of the front end test stand project is to demonstrate that chopped low energy H(-) beams of high quality can be produced. The beam line currently consists of the ion source, a 3 solenoid low energy beam transport and a suite of diagnostics. A brief status report of the radio frequency quadrupole is given. This paper details the work to optimize the ion source performance. A new high power pulsed discharge power supply with greater reliability has been developed to allow long term, stable operation at 50 Hz with a 60 A, 2.2 ms discharge pulse and up to 100 A at 1.2 ms. The existing extraction power supply has been modified to operate up to 22 kV. Results from optical spectroscopy measurements and their application to source optimization are summarized. Source emittances and beam currents of 60 mA are reported.

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Section: B Vary Pulsed Discharge Currentmentioning

confidence: 83%

Optimizing the front end test stand high performance H− ion source at RAL

Faircloth

Lawrie

Gabor

et al. 2012

Review of Scientific Instruments

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“…Some research indicated that the electron temperature can be determined using the line intensity ratio of hydrogen. [21,22] This method is also used in our work by measuring the line intensities of H α and H β for the determination of the electron temperature. Figure 15 presents the results for pure hydrogen and hydrogen with noble gas (gas mixture).…”

Section: Comparison With Other Methodsmentioning

confidence: 99%

Understanding hydrogen plasma processes based on the diagnostic results of 2.45 GHz ECRIS at Peking University

Wu¹,

Ren²,

Peng³

et al. 2017

Chinese Phys. B

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Optical emission spectroscopy (OES), as a simple in situ method without disturbing the plasma, has been performed for the plasma diagnosis of a 2.45 GHz permanent magnet electron cyclotron resonance (PMECR) ion source at Peking University (PKU). A spectrum measurement platform has been set up with the quartz-chamber electron cyclotron resonance (ECR) ion source [Patent Number: ZL 201110026605.4] and experiments were carried out recently. The electron temperature and electron density inside the ECR plasma chamber have been measured with the method of line intensity ratio of noble gas. Hydrogen plasma processes inside the discharge chamber are discussed based on the diagnostic results. What is more, the superiority of the method of line intensity ratio of noble gas is indicated with a comparison to line intensity ratio of hydrogen. Details will be presented in this paper.

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“…Fig. 5 shows the improvement in quality of data to be expected with the new monochromator, compared with the Stellarnet CCD spectrometer used in an initial plasma spectroscopy study [12]. Lessons Learnt to be Implemented in the VESPA Mk.…”

Section: Emission Spectroscopymentioning

confidence: 99%

Design study of a test vessel to investigate the ISIS H− Penning ion source plasma

Lawrie

Faircloth

2013

AIP Conference Proceedings

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A vacuum-vessel for extraction and source plasma analyses (VESPA) has been constructed with the aim of understanding the dominant plasma processes of negative hydrogen (H -) ion formation in the ISIS Penning ion source. The VESPA has been designed to be simple and inexpensive, with all features of the ISIS ion source not directly responsible for plasma formation removed such that there is ample space for diagnostics close to the plasma. Diagnostics will include but are not limited to a beam current density monitor, a high resolution visible-light monochromator, a cesium mass deposition monitor, an electrostatic energy analyser, a magnetic mass spectrometer and an emittance scanner. Several existing parts and ancillary equipment are re-used to reduce costs and to speed up installation. The ultimate aim of the VESPA is to perform detailed analyses of the Hproduction, cesium usage and beam formation such that an upgrade to the ion source is both well informed and possible using this setup. This report details the design philosophy, results of initial testing and future plans.

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Initial study of the optical spectrum of the ISIS H− ion source plasma

Cited by 4 publications

References 5 publications

Optimizing the front end test stand high performance H− ion source at RAL

Optimizing the front end test stand high performance H− ion source at RAL

Understanding hydrogen plasma processes based on the diagnostic results of 2.45 GHz ECRIS at Peking University

Design study of a test vessel to investigate the ISIS H− Penning ion source plasma

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